Rotary engine



(No Model.)

G. H. WESTON. ROTARY ENGINE.

No. 449,148. Patented Mar. 31,1891.

UNITED STATES PATENT OEEICE.A

GEORGE II. VESTON, OF BOSTON, MASSAOHUSE'VIS.

ROTARY ENGINE.

SPECIFICATION forming` part of Letters Patent No. 449,148, dated March 31, 1891.

Application tiled August 28, 1890. Serial No. 363,299. (No model.)

To all whom, it may concern:

Be it known that I, GEORGE II. IVESTON, of Boston, county of Suffolk, State of Massachusetts, have Vinvented an Improvement in Rotary Engines, of which the following description, in connection with the accompanying drawings, is a specification, likeletters and iigures on the drawings representing like parts.

This invention relates to rotary engines and is an improvement upon the engine shown and described in United States Patent No. 426,553, granted to me April 29, 1890.

My present invention has for its object to improve the construction ofthe engine referred to, whereby the valve may be opened at an earlier period of its stroke.

In accordance with myinvention the pistonvalve at its port-opening is provided with a longitudinal arm to enter a longitudinal groove or recess in the abutment, whereby the space between the abutment and pistonvalve is made steam-tight, thereby enabling the valve to be opened at an earlier period of its stroke or revolution.

Other features of my invention will be pointed out in the claims at the end of this specification.

Figure 1 is a transverse section of a rotary engine embodying my invention, the section being supposed to be taken on line @Fig 2; Fig. 2, asection of the engine shown in Fig. 1 on the line fr Fig. 3, a detail to be referred to, and Fig. 4 a detail of the form of gearing preferred by ine.

The cylindrical case A, provided with the bearings a a', the bearing a being extended into the said case and having mounted upon it the abutment a2, located within the case A, and the cover a3, secured to the said case, are and may be substantially such as shown and described in United States Patent No. 426,553, granted t-o me April 29, 1390.

The abutment a2, herein shown as detachably secured, as by screws a4, to the enlarged head a5, secured to or forming part of the shaft a, is provided in accordance with my invention with a longitudinal or axial groove, channel, or recess al. (See Figs. 1 and 3.) The shaft a, as herein shown, is extended through the bearing-sleeve as, made conical at its inner end, as at a. The shaft a is coupled, as shown, by gears d10 cl2 to the shaft als, to the enlarged head al* of which is secured, as by-screw al, the piston-valve a, preferably provided at its front end withthe projecting portion als and at its rear end with the flange al. The piston-valve au is provided with a longitudinal slot or port opening b, (see Figs. 1 and 3,) and one wall of the said slot is provided with an extended lip b', which projects into the groove al and fits therein steam-tight, the said lip extending the length of the said groove or channel. The piston-valve is provided with the arm Z13, which enters the re-entrant portion b* of the abutment, the said arm being made separate from the piston-valve and secured thereto in any suitable manner, as by a screw or bolt bm. By making the arm b3 separate from the piston-valve I am enabled to employ lighter metal, such as alumina.

The hollow piston-valve a has co-operating with it the cut-off b5, provided with the stein or rod extended out through the cover a3, as in the patent referred to. By means of the lip h entering the groove a7 and fitting steamtight therein the piston-valve may be made to open earlier, as the said lip prevents the escape of live steam into the exhaust-port bs.

Referring to Fig. 3, the lip b on the pistonvalve is shown in contact with one edge, as 2, of the groove or channel CLT, and the port-opening or space between the abutment and the piston-valve from the point 3 to the said lip is rendered steam-tight, so that the steam-inlet port of the valve may be opened earlier than if the lip b was omitted.

Referring to Fig. 4,1 have shown the form of gears al al? preferred by me, the gear am being provided with teeth d20, having a flat face, as 20, in a radial line with .the center of the gear, the said face preferably having fitted into it a buffer 30 of leather or like material. The gear C012 is provided with teeth am, having one side or face, as 4, made curved so that the point of contact of the teeth d20 am is in a direct line with the centers 7 S of the gears.

By making the arm Zr of alumina the piston-valve is not thrown so far out of balance,

and consequently does not have to be provided with as much counterbalancing metal d10 as would be the case if the said arm is made of steel or other heavier metal.

IOO

l claimit. In a rotary ei1gine,tl1e combination, with an inelosing case provided with a bearing, of an abutment having` a re-entrant portion and a groove or channel ai on its periphery eK- tended axially, a shaft for said abutment, a pistolrvalve provided with an arm to enter said re-entraut portion and with a lip D' to enter said groove or Channel, and a shaft for said piston-Valve, substantially as described.

2. In a rotary engine, the combination, with an inolosing` ease provided with a bearing, of an abutment having a re-entrant portion and a groove or Channel CLT on its periphery extended axially, a shaft for said abutment', a

gear al" on said shaft', a hollow lusten-valve 

